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USGS is a primary source of geographic information system (GIS) data. Our data and information is presented in spatial and geographic formats, including The National Map, Earth Explorer, GloVIS, LandsatLook, and much more. Explore GIS Data Maps. 

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Geologic map of the Ptolemaeus Quadrangle of the moon Geologic map of the Ptolemaeus Quadrangle of the moon

The Ptolemaeus quadrangle is near the center of the lunar disk, in the northern part of the southern highlands. Smooth dark maria border the quadrangle on the west and north, but most of the area is complex, highly cratered terra.
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